Golubac Fortress (Golubacka trvdjava, or Goluback Grad) taken during a sunny afternoon. The Golubac Castle was a medieval fortified town on the Danube River, 4 km downstream from the current city of Golubac Picture of Golubac Fortress, on the Danube river, taken during a sunny afternoon. It is one of the main landmarks of the iron gates valley, and of Serbia as well, Image: 353344617, License: Royalty-free, Restrictions: , Model Release: no, Credit line: Jerome Cid / Alamy / Alamy / Profimedia